Spark plug



D. SWAN.

SPARK PLUG. APPLicAloN FILED 53.26, 1920.

Patented Apr. i1, 1922.

WHA/moo Unirse 'mehr eprice.

DiARIOUS SWAN, OF WORTHINGTGN, INDIANA SPARK PLUG.

- To all whom t 'may concern.'

Be it 'known that sl, DARIoUs SWAN, a citi- Zen o'fj the United States, residing at orth- -ington, .inthe fcounty vot' Greene and State ,employed 'in the; ignition systems of internal .comb ustioneng1nes, and it is the primary object of the invention to provide a plug having'visibleelectrodes adapted to spa-rkv simultaneouslywith the sparking' ot' thev indicating thebelowl the lowerlend ofthe core `10 to pro 'usual vspark points, thus operativeness ofthe-plug; y

A further obect ofthe invention is-to \providemeansto intensify the elect-ric current 'passing through the plug, 'by interrupting the current through` the main electrode.' i A still further object oftheinvention 1s to provide. ,a plug of this character having an intensifyingl spark point cooperating "with the usual spark points'joftheplug, to

further intensify'the electrical ci'irrentth e re` v by'jproducing ani exceedingly hot' spark. a

A With the foregoing and other objects-'m view. which 'will appear .as the des cr1pt1on roceeds, the invention :residesin the com- 'Emation and arnengementof' parts-and .in l*the details of construction hereinafter, d e-.

. .scribed and c1aimed,.it beingA understood thet 'changes in` fthe precise embodiment of the -f'in'ventio'n herein disclosed, may be made within the scope-fof what' is claimed, without delpar'ting from the spiritofthe invention..v

' conductor 18, which isin the form of a rei .Figure 1 illustretes a side elevational view fof afspark Refer-ung l l "n'vention is shownlas includlng a. shell cornplug constructed in accordance withthe present invention.

to the i detail, Ithe pri'sing aiower'section 51and an upper SectionA 6, f the lower section 5 being'threaded .5o-. the' usuall spark plug opening of the .engine as at' 7gto. permit the-plugto be inserted 'in Specification of lLetters Patent.

spark is produced'.

The upper section 6"isfalso` threadednnd. o ope'retes withtlie threads@ fortified vonthe Supper Vextremity fof the I owe'r section 5, for -seeuri'rgthe upperfsection endllower sec- Patented Apra 11, 1922.

\ .rction led February 26, 15520. Serial No. 361,534.

tion together, lthe upper section being provided With Va-Hange 9 adapted to cooperate with thecore 10 of the plug proper, for se vcuring the core within the Shell.

Embedded within'the core 10, which is 'formed 'of porcelain or other suitable insulating material, is a main electrode 11 whichhas its upper end terminating short of the upper end of the core l0, and in spaced relation with the lower end or the relatively short electrode l2 to provide a spark gap between-the.-electrodes 11 and 12 to intensify the current passing through Vthe plug.

The lower'end of the electrode 1 1 extends vide the .spark'point 13, which extends towards the point 14@ disposed between the points 13'and-l5, the. point '1'5 being proj- 'vided on the lowerextremity ofthe electrode 16,.- forming animportant featureoiC the present invention, Frein 'thelforegoinv it is obvious that'when'current isfappli'e .to the electrode 12, the`sa1ne on passing to 'the electrode 11`jurnps the spece betweenthe electrode 11 and' 12,"to the end that the 'current is intensified. As the current passes to the lower extremity [of the plug proper,

i'lrtherintensified and an exceedingly hot FormedV .within the'core' 10, and disposed adjacentthe upper extermitythereof is a chamberl? which accommodates the upper end of tiieelectrode 156 cooperating with tin` ativelyv long .erin having its lower extremity vof 4the arm being apertured to support, the

d'iskif19 formed of mica, or other suitable vtransparent material', and as shown this disk 19 `is clamped between vone .Wall of the arm,-

andthe downwardly extending conductor 18.

The usual insulating cap 20 is positioned on the uppei extremity of the core 10,.-and

cooperates with'the thumb screw 21 for se.-

curing a circuit terminal to the plug, the

screw QLbeing constructed to operate on" the upper extremity of the ,electrode 12.`

- Iii-the operation of the device, it isobvious 'Y thtivhen current is'supplied to the' plug through the electrodes 11 and 12, the current' 'will pess'between the points 1 3, 14 .end l15,

through the electrode 16, 'where the eurrent 'will jump from the upper end, of the electrode 1G to the conductor i8, producing a Spark at this point siinuitaneousiy with the sparking at the sparking,- end ot the ping. From the foregoing it is obvious that it' a spark is `produeed between the upper end of the conduct-or 18 and electrode le, a. spark is being produced between the points l', lil and l5, but if no spark is risible through the disk 19, the indieatiom` are that no spark is being produced Lehrern the points 12K, M and 15 to the end that the plug,r should be removedand cleaned, or repaired.

Having thus defieribed the invention, what 'I claim as new iS:-

n a spark piug, .a sheii, a core positioned within the shell, Said core having a chamber formed adjacent to the upper end thereof, a conductor having portions thereof bent to grip a disk of transparent material, to provide a Cover for the chamber, one end of the conductor contacting with the shell, a

central electrode, and an electrode, having 

